#include using namespace std; int main(){ int a,b,sum=0; cin>>a>>b; while(a<=b){ if(b%2==0){ continue; }else{ sum=sum+a; } a++; } return 0; }

#include<iostream>
using namespace std;
int main(){
    int a,b,sum=0;
    cin>>a>>b;
    while(a<=b){
        if(b%2==0){
            continue;
        }else{
            sum=sum+a;
        }
        a++;
    }
    return 0;
}